4. A boundary layer forms on a convex curve. Over this curve the boundary layer detaches and does not reattach. (a) Sketch and label typical velocity profiles for the laminar, turbulent, and detached regions of the boundary layer. [2 marks] (b) Sketch the formation of a boundary layer on the curve, labelling the laminar region, the turbulent region, the laminar sub-layer and the detachment point. [4 marks] A different boundary layer forms on a flat plate which is set parallel to an airstream, at standard sea level conditions, moving at 35m/s. (c) Calculate the distance from the leading edge to the transition point if the transition Reynolds number is 5.5 105 .[3 marks]